Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

 
 
DownloadE-Mail
  Electronic and geometric structure of NH3 on Ge(001) under equilibrium adsorption conditions

Ranke, W., & Platen, J. (1996). Electronic and geometric structure of NH3 on Ge(001) under equilibrium adsorption conditions. Physical Review B, 54(4), 2873-2879. doi:10.1103/PhysRevB.54.2873.

Item is

Basisdaten

einblenden: ausblenden:
Genre: Zeitschriftenartikel

Dateien

einblenden: Dateien
ausblenden: Dateien
:
PhysRevB.54.2873.pdf (Verlagsversion), 205KB
Name:
PhysRevB.54.2873.pdf
Beschreibung:
-
OA-Status:
Sichtbarkeit:
Öffentlich
MIME-Typ / Prüfsumme:
application/pdf / [MD5]
Technische Metadaten:
Copyright Datum:
1996
Copyright Info:
APS
Lizenz:
-

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Ranke, Wolfgang1, Autor           
Platen, Jutta1, Autor           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: The adsorption of NH3 on the Ge(001) surface is studied by angle-resolved UV-photoelectron spectroscopy using synchrotron radiation and by high-resolution low-energy electron diffraction (LEED) measurements. On the clean surface, the phase transition from 2×1 to c(4×2) is observed over a temperature range from 400 to 220 K. Measurements during NH3 admission at varying temperature in adsorption-desorption equilibrium yield a sequential occupation of several states. Up to 1/2 ML (one molecule per reconstruction dimer), NH3 is bound strongly on the dimer down atoms with the Ge-N axis perpendicular to the surface (α state). The adsorption occurs via a mobile precursor state. The α state is connected with a (2×2) superstructure. Yet, the transition c(4×2)→(2×2) starts already at very low coverages (0.01 ML) and is completed for about 0.04 ML. We propose that a long-range attractive interaction causes α-NH3-island formation and that a short-range repulsive interaction is responsible for a change to 2×2 within the islands by a dimer flip of every second dimer row. At the island edges, this dimer flip continues over the clean part of the surface thus changing its structure to 2×2 long before 1/2 ML saturation. Beyond 1/2 ML, the structure changes again. A good-quality 2×1 structure is seen up to 4 ML indicating pseudomorphic growth up to this coverage. Beyond 4 ML, the adsorbate structure changes irreversibly to NH3-ice without any LEED pattern.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 1995-11-131996-07-15
 Publikationsstatus: Erschienen
 Seiten: 7
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevB.54.2873
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: 7 Band / Heft: 54 (4) Artikelnummer: - Start- / Endseite: 2873 - 2879 Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008